Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

It provides specific context regarding the data's age by warning that the 'Index-build time is not the publication date of a historical text.' This is critical information that goes beyond what a simple 'list' function name or standard annotations would convey, helping the agent interpret the results correctly.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The definition uses two well-structured sentences. The first defines the resource and its attributes, and the second provides a necessary caveat, ensuring that every word serves a functional or informational purpose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the zero parameter count and lack of output schema, the description is highly complete. It informs the agent exactly what data the tool will yield, allowing it to determine relevance and interpret results even without a formal return structure.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Since there are 0 parameters and 100% coverage, the description is free of the obligation to compensate for missing schema details. It adds strong semantic value by listing all the specific data fields (traditions, source policy, content types) that the agent should expect in the response.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly defines the purpose as listing available book landing pages and related metadata. It specifies exactly what information will be returned (landing pages, traditions, content types, etc.), making it unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description guides the user on when to use the tool, stating it should be used 'before exploring The Old Ways.' While it doesn't explicitly say 'use this before [sibling tool],' it clearly defines its role as a discovery/prerequisite step.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.